QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7md

1 km WNW of Santa Isabel, Puerto Rico

· 9.0 km deep · released about 10 lb of TNT

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10 km30 km60 km120 km N Santa Isabel Municipio 4 kmJuana Díaz Municipio 8 kmCoamo Municipio 16 kmSalinas Municipio 16 kmVillalba Municipio 19 kmPonce Municipio 20 kmAibonito Municipio 24 kmOrocovis Municipio 28 kmBarranquitas Municipio 28 km
Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
Magnitude
M 1.7 (md)
Depth
9.0 km below the surface
Felt
no reports yet
Nearest
Santa Isabel Municipio, 4 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2608 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 10 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 92× the energy of this one
  4. This earthquake M 1.7 about 10 lb of TNT

Energy from the Gutenberg–Richter relation (log10E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.

Where

Epicentre 17.9715, -66.4181. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Santa Isabel Municipio, PR 4 km (2 mi) WNW of here earthquakes near Santa Isabel Municipio
Juana Díaz Municipio, PR 8 km (5 mi) ESE of here earthquakes near Juana Díaz Municipio
Coamo Municipio, PR 16 km (10 mi) SSW of here earthquakes near Coamo Municipio
Salinas Municipio, PR 16 km (10 mi) W of here earthquakes near Salinas Municipio
Villalba Municipio, PR 19 km (12 mi) SSE of here earthquakes near Villalba Municipio
Ponce Municipio, PR 20 km (13 mi) E of here earthquakes near Ponce Municipio

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

45 earthquakes have been recorded within 50 km since this one.

  1. 1.5 8 km WNW of Adjuntas, Puerto Rico
  2. 1.6 8 km W of Adjuntas, Puerto Rico
  3. 2.0 1 km SE of Santa Isabel, Puerto Rico
  4. 1.5 8 km S of Salinas, Puerto Rico
  5. 2.0 1 km S of Manatí, Puerto Rico
  6. 2.6 5 km SSW of Indios, Puerto Rico
  7. 1.7 4 km ESE of Ponce, Puerto Rico
  8. 1.9 8 km S of Indios, Puerto Rico
  9. 1.6 2 km SSE of Ponce, Puerto Rico
  10. 1.5 5 km WSW of Naranjito, Puerto Rico
  11. 1.9 2 km S of Adjuntas, Puerto Rico
  12. 1.6 2 km SE of Santa Isabel, Puerto Rico
  13. 1.8 11 km SSE of Ponce, Puerto Rico
  14. 2.2 1 km S of Río Cañas Abajo, Puerto Rico
  15. 1.9 Puerto Rico region

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

For this area

The largest earthquake within 50 km in our catalogue was M 4.6 on 2019-03-12 — it released about 23,000 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.